Shelly Plus Smoke Alarm – Smart WiFi Smoke Detector

Smart smoke detector with instant smartphone notification

A smoke detector that only beeps when you are home is insufficient. The Shelly Plus Smoke Alarm optically detects smoke, immediately emits a loud alarm of over 85 dB, and simultaneously sends a push notification to your smartphone. This way, you know what's happening at home even when you're not there, and you can directly control other devices via your home automation platform.

Power and connectivity

The detector operates completely wirelessly on a supplied CR123A battery with an expected lifespan of approximately 5 years. Connectivity is via WiFi 2.4 GHz (802.11 b/g/n) and Bluetooth 4.2. A hub or controller is not necessary: the smoke detector connects directly to your home network.

Functionality and settings

Upon smoke detection, the detector activates an acoustic alarm of more than 85 dB and a visual LED signal. You receive a push notification on iOS or Android via the Shelly Cloud app or local integration. The detector also works standalone without a WiFi connection: the acoustic and LED alarm then function without smartphone notification. Via webhooks and personal scenes, you can automatically control other Shelly devices upon smoke detection, such as switching off electrical appliances or opening roller blinds.

Expansion and accessories

The Shelly Plus Smoke Alarm cannot be interconnected with other smoke detectors for a group alarm. Do you want to secure multiple rooms? Then install a separate detector per room and link them via Home Assistant or the Shelly Cloud app in a single overview. View the complete Shelly assortment for additional smart devices.

Safety and reliability

The detector uses optical detection, which is particularly sensitive to smoldering fires with significant smoke development. The built-in low battery indicator warns you in time via the app when the battery needs to be replaced. The device is suitable for indoor use only and operates reliably at temperatures from 0 °C to +55 °C.

Home Assistant

The Shelly Plus Smoke Alarm integrates with Home Assistant via the Shelly integration over WiFi.

1. Connect the detector to your WiFi network via the Shelly app or web interface.
2. In Home Assistant, go to Settings > Integrations. The detector will be automatically found via mDNS, or enter the IP address manually.
3. After coupling, a binary_sensor for smoke detection, a sensor for the battery percentage, and a button entity for the test function will appear.
4. Local control via the HTTP API is confirmed. Cloud connection is optional and can be disabled.

Homey

The Shelly Plus Smoke Alarm works with Homey Pro via the official Shelly app from the Homey App Store. The connection is local via WiFi without the intervention of the Shelly Cloud. Coupling is possible via the Shelly Cloud via Homey Bridge. Zigbee and Matter do not apply to this device.

Other platforms

• Google Home: compatible via Shelly cloud
• Amazon Alexa: compatible via Shelly cloud
• Apple HomeKit: not natively supported, but via third-party integrations
• Domoticz: compatible via MQTT or the Shelly HTTP API
• HomeSeer: compatible via Shelly cloud or MQTT

Automation examples

Push notification upon smoke detection

1. Connect the Shelly Plus Smoke Alarm to Home Assistant via the Shelly integration.
2. Create an automation with trigger: binary_sensor smoke detector turns on.
3. Add an action: send a notification via the HA Companion app with text "Smoke detected in the kitchen! Check immediately."
4. Optional: add a second action that issues a TTS notification via a smart speaker.
5. Save and test via the test button on the device.

Switch off appliances and open roller blinds in case of fire

1. Trigger: binary_sensor smoke detector turns on.
2. Condition: time between 22:00 and 07:00 (sleeping residents).
3. Action 1: switch off all Shelly switches in the house via a group action.
4. Action 2: fully open all smart roller blinds via their cover entities.
5. Action 3: send an urgent push notification to all household members via the HA Companion app.

Points of attention

• ⚠️ The detector cannot be interconnected with other smoke detectors for a group alarm (NEN 2555).
• Suitable for indoor use only at 0 °C to +55 °C.
• Not suitable for areas with a lot of steam, dust, or chemical fumes due to the risk of false alarms.
• WiFi connection is required for smartphone notifications and home automation integration. Standalone operation (acoustic and LED only) is possible without a network.
• Mount the detector on the ceiling or high on the wall, at least 50 cm from the corner.
• Replace the battery as soon as the low battery indicator activates. Use CR123A only.

Package contents

• 1x Shelly Plus Smoke Alarm (SNSN-0031Z)
• 1x CR123A battery
• 1x Mounting material (ceiling bracket and screws)
• 1x Multilingual user and safety guide

Compatibility

Home Assistant (WiFi), Homey Pro, Google Home, Amazon Alexa, Domoticz, HomeSeer, IFTTT, Shelly Smart Control (iOS and Android), MQTT, local HTTP API.

Frequently asked questions

How do I connect the Shelly Plus Smoke Alarm to Home Assistant?

Connect the detector to your WiFi network via the Shelly app or web interface. Home Assistant automatically detects the device via mDNS. Go to Settings > Integrations and accept the notification, or enter the IP address manually. More devices of this brand can be found in the Shelly collection.

Do I need a hub?

No. The Shelly Plus Smoke Alarm connects directly to your home network via WiFi 2.4 GHz. A separate hub, controller, or subscription is not required. For use with Home Assistant, the built-in Shelly integration is sufficient.

Is the battery included?

Yes, a CR123A battery is included. The expected lifespan is approximately 5 years with normal use. The app will notify you when the battery is low. When replacing, use only a CR123A battery.

Can I connect multiple detectors for a group alarm?

Direct interconnection for a group alarm (as required by NEN 2555) is not possible. Do you still want to achieve a group alarm? This can be done via Home Assistant: connect multiple detectors and create an automation that activates all other detectors as soon as one detector reports smoke detection. View all available smoke detectors in the assortment.

Does the detector work without WiFi?

Yes, standalone operation is possible. Without a WiFi connection, the acoustic alarm (more than 85 dB) and the LED signal remain active. Smartphone notifications and home automation integration do require an active WiFi connection.

Where should I hang the smoke detector?

Mount the detector on the ceiling or high on the wall, at least 50 cm from a corner. Avoid placement in kitchens, bathrooms, or garages due to steam, dust, or exhaust fumes that can cause false alarms. Every bedroom and the hallway on each floor should have its own detector.

Is the Shelly Plus Smoke Alarm suitable for outdoor use?

No. The device has no weather resistance and is only suitable for indoor use at temperatures from 0 °C to +55 °C. View the security category for outdoor options.

🔥 Order the Shelly Plus Smoke Alarm today at slimhuisje.nl and receive an instant notification on your phone when smoke is detected, wherever you are. Smart security!